Assassins Creed Revelations Sequence 9- Revelations
Memory 1 - Walk with Sofia up through Masyaf and into the keep itself. To the left of the main staircase is a path leading down to Altair's library. Place the 5 Masyaf Keys into the door, and you'll be tasked with solving a puzzle to open the way forward.
Use your Eagle Sense to view the outlines of the constellations. Each of your keys can only fit in one spot. Pay attention to the amount of lines on each key and the angles at which they meet. Match them up to the lines on the door to complete the puzzle. The solution can be found below.
Light the torches along the hallway before stepping into the library proper and discovering the body of Altair and the final Masyaf Key.
Memory 2 - The only action in this Memory is for you to douse the torches that line the hallway.
It's as easy as pie!
Memory 3 - Just sit back and watch the ending to Assassin's Creed: Revelations.